Self-contained pot press



Nov. 23 1926. 1,607,722

, v F. s. CARVER SELF CONTAINED POT PRESS Filed y 11 1924 5 Sheets-Sheet1 [NVENTOR ATTORNEY Nov. 23,1926.

' s. CARVER v SELF C QNTAINED POT PRESS Filed July 11. 1924 3Sheets-Sheet 2 INVENTOR @2 0 5? Cb/v'e/ ATTORNEY Nov. 23 1926.

F. s. CARVER SELF CONTAINED POT PRESS Filed July 11 1924 5 Sheets-SheetBY M ATTORNEY piston bottom before the pot is filled and charged thereinand served as a top filter close of the filling operation, stripping theejection and removal of the press cakes after reamed Nov. 23, 1926. iUNITED STATES PATENT OFFICE.

. FRED S. CARVER, OF EAST DEAN GE, NEW JERSEY.

SELF-CONTAIKEb POT PRESS.

Application filed july 11, 1924. S iaI No. 725,400.

My invention relates to a pot press for vention could be secured withother forms of expressing fluids from fluid containing material chargedinto the press pots, and particularly to a self-contained pot press.

For afi'ordirig an understanding of the invention I have illustratedherein the embodiment thereof ina cocoa press for expressing cocoabutter from ground cocoa beans, but it is to be understood that theembodiment shown is for illustration only andfor affording anunderstanding of the invention, which can be put to a large number ofuses.

In operating prior pot presses it has been necessary, to make use offilter ads of camels hair or the like material. ne such pad has been putinto the pot to cover the into the press platens and piston pot bottoms,I preferably make use of filter plates as described in my copendingapplication Serial No. 682,823, filed Dec. 26, 1923, com- .nous metallicplate, which is in turn backed up by hard rolled coarse wire meshaffording a substantial support for the foraminated plate and providingextensive lateral egress for expressed fluid. A

In the accompanying drawings, Fig. 1 is a side view of a press. Fig. 2is an end view. Fig. 3 is a fragmentary detail view I partly in sectionand i lustrating the spring support of one of the pots in each pair fromthe underlying press platen. Fig. 4 is a section on the lined-4, Fig. 5.Fig. 5 is a section on the line 55, Fig. 3. Fig. 6 is a diagrammaticalview showing the relation of the pots in pairs to the press platens.Fig. 7 is a detail view of the preferred form of built-in filter platefor the ress platens, and Fig. 8 is a cross-sectional etail view of thepress platen filter plate.

Press base 10 and head 12 are connected by massive through bolts 14 toho d the head 12 down against the thrust of the hy draulic ram 16located in the base 10.

Thepress ots 18 are arranged in pairs 18, 18", to slide in and out inslideways 20 supported in the machine framework. These slideways are incommunication with the intermediate slideways 22, spring supported onthe press platens 24 by the heavy coil springs 26, as shown in my PatentNo. 1,478,699 of Dec. 25, 1923, automatic press. When one of the pots ofa pair is in the press on the platen slideway 22, the other pot of thepair is out on the framework slideway 20, as indicated respectively at18, 18", Fig. 5., When in the out position the cake is ejected by thehydraulic ejecting device indicated .at 28, 30, Fi s. 1 and 2 (see myPatent No. 1,486,633 of Mar. 11, 1924) and the pot is filled by-turningthe appropriate filling cock 32, Figs. 1 and 2, controlling -the nozzle33 located over the pot in out position. .(The filling apparatus isshown in detail in my copending application Serial No. 366,364, filedMar. 16, 1920, filling apparatus for presses.)

e preferred form of built-in filter means is shown in Figs. 3 and 4, andthe served as a bottom filter means. Another removable fiHter pad oraremovable plate carrying a fi ter pad has been put on.the

top of the pot after the material was means. The filter pad placed ontop has been larger than the one put in the pot in order that it mayextend over the pot top and serve as a sealing means when the top of thepot was brought up against the ress platen. In operating the press theban ing of camels hair' pads has been troublesome, involving selectionof the right sized pad, insertion of pads at the commencement and padsfrom both sides of the press cakes after the pressing operation wascompleted, all of which are laborious operations and slow up the pressoperation or take the press tender from the other 0 rations of the presswork, or both, and the wear and tear of camels hair filte r pads is veryexpensive.

These various objections are eliminated in the press in a-ccordance withthe present invention, in which the use of separate filter ds isentirely dispensed with, and the %ter means are built into the pistonpot bottom and into the press platens respectively, and simplify thefeatures of the press operation just referred to by complete eliminationof the handling of the separate camels hair filter pads, so that allthat is required in connection therewith is the mere filling of the potsprior to pressing and pressing, with no handling of separate filterWhile the advantages of the present infilter means, which can bepermanently built prising a surface layer of fine mesh metallic filtercloth backed up by a highly forami-- filter plate as applied to theunderside oi the press platen is illustrated in detail in 7 and 8. Thefilter late 34, which is secured to the underside o the press platen ischambered out or recessed on its under face, as indicated at 36, and isprovided in the recess with the following arts in the order indicated:the backing dis 38 of hard roller coarse wire mesh, the plate 40 oftoraminous sheet metal with closely spaced holes 42, and the fine meshwire filter cloth 44, all held in place by the ring 46 screw fastened tothe plate 34. A sealing ring 48 of material such as bronze, fibre or thelike ipis inserted in a groove 35 provided in the filter plate 34, andby projecting from the groove serves to seal the opening about the pottop when the latter is raised by the.

ram 16 acting through the springs 26 into contact therewith. The springsupports compensate for any irre ularity o r unevenness in closing andenable the pot to seat itself automatically against the sealing ring 48all the way around and to make a complete sealing engagementwithoutleaks at any point.

The expressed fiuid passes out through the wire mesh filter cloth 44 andthe holes in the sheet metal 40, and being distributed laterally throughchannels in the coarse mesh material 38 is discharged through the holes51 and discharge ducts or channels 52, 54 in the plate 34.

The bu1lt-in filter means 56 for the iS ton pot bottoms 58 arepractically identical with the built-in filter means just described forthe press platens, being, however, of course, reversed to bring thefilter mesh into contact with the material chargbed into the press pot,and having a suita le packing ring 57, as of leather or the like, at theedge. Filter means constructed as described do not stick to the cake asis the case with the usual fibrous pads heretofore used.

The operation will be readily understood. In the form shown there are.five of the platens 24 equipped with the built-in filtermeans on theirunder sides,-and ten of the press pots 18 with the piston ot'bottoms 58equipped with the built-in lter means 56. i The five built-in filtermeans of the five press platens are in use at each presssaid room-teaengagement with the sealing ring 48 in .the

platen filter plates, and the springs 26 being compressed by a furtherrising of the ram 16 the plungers 2% on the press platens 2t serve toelevate the piston pot bottoms 58 and to force the liquid portion of thecontents thereot through the built-in filter means in both the pistonpot bottoms and the press platens.

lln operation, therefore, the pots are filled, pushed in, pressed,withdrawn, and the cakes ejected and taken away, nothing being handledbythe press operator but the ca re.

As is stated above, the built-in filter means shown herein areillustrative only, and the advantages of the present invention may berealized with other forms ofbuilt-in filter means, whereby the press ismade a selfcontained apparatus and the supplying and handling ofseparate filter means is dispensed with.

p I claim:

1. A pot press of the type wherein pots with piston bottoms are adaptedto be in terposedbetween press platens, characterized in that both thepiston pot bottoms and the press platens comprise built-in filter means,making the press self-contained and dis ensing with the use of separatefilter pa s.

2. In a press, a series of press platens having spring supporting meansfor sup porting press pots thereabove, guide means for the platens, aseries of pots with piston bottoms, said pots bein adapted to besupported by said spring supporting means, piston pot bottoms and theunder part of said platens being provided with built-in filter means,and means for applying pressure to the platens with the pots betweenthem, whereby prior to expression of the fluid contents of the pots thesprings are first compressed toautomatically bring the pot tops intoself-adjusting sealing engagement with the filter means on the underside of the press platens, and the press is made self-contained and useof separate filter pads dispensed with. r

In testimony whereof, I have signed my name hereto.

FRED s. canvnn.

